QS Study

In ionic crystals, the units occupying lattice points are positive and negative ions. Each ion of a given sign is held by coulombic forces of attraction to all ions of opposite sign. The forces are very strong. The ionic crystals have the following characteristics.

  • The heats of vaporization of ionic crystals are high.
  • The vapour pressure of ionic crystals at ordinary temperature are very low.
  • The melting and boiling points of ionic crystals are very high.
  • Ionic crystals are hard and brittle.
  • Ionic crystals are insulators in the solid state.
  • Ionic crystals are soluble in water and also in other polar solvents.
  • Ionic solids are good conductors when dissolved in water.